It is more of a problem than you think. I have seen time and again, miscredits on LP's, CD's and downloads due to cover errors from previous releases. When an artist who likes a song and wants to record it, Googles a song title and it says 'Composed by' as a matter of fact, that adds to the chances of them taking that and putting it on their own release. Sometimes it works in favour, if the information is correct, but often it isn't, and Discogs was autocreating false credits from an auto-harvesting feature.    Believe me, I have seen copyright problems snowballing due to this type of thing many times over. I have no complaint whatsoever as a source of finding albums, but is the sticking its oar into waters and Google linking spurious credits and bringing back misprints of song credits that I have the problem with. Unless you are involved in song copyright then you probably wont get how easily these false attributions by misunderstanding happen. Also it can't differentiate between different versions of songs, or songs under alternate titles, different spellings of the author composer's name and the claims of dates when they first appeared.   Less is more... they would have been better sticking to a source of recordings as a discography, which is useful.